Where did the moon come from? Easy: it's the birthed core left behind by Venus before the planets shifted closer to sun and settles into their current orbits. Soon, Earth will birth her core as well, leaving it behind for Mars on the next leg of the great migration! Mercury? A left over core from a planet that has fallen into the sun. Any questions? Ask away!

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The core grows as heavy metals concentrate (the scientific process is known as different tiation). Eventually, it will be too big to sustain and will be expelled. In the case of the earth, the core will birth from the Weddel Sea.